Rent vs Buy Calculator
The honest mortgage vs rent comparison. Full amortization engine, PMI auto-removal, opportunity cost of down payment, hidden costs reveal, sensitivity heatmap, and break-even timeline — all in your browser.
| Inv. Return → Appreciation ↓ | 2% inv | 5% inv | 7% inv | 9% inv | 12% inv |
|---|---|---|---|---|---|
| 0% appr | -$22K | -$66K | -$104K | -$149K | -$237K |
| 2% appr | +$61K | +$16K | -$21K | -$67K | -$155K |
| 4% appr | +$159K | +$115K | +$77K | +$31K | -$57K |
| 6% appr | +$276K | +$231K | +$194K | +$148K | +$60K |
| 8% appr | +$414K | +$370K | +$332K | +$286K | +$199K |
Is It Better to Rent or Buy Right Now?
The rent vs buy debate is the most argued question in personal finance — and the answer is not what most people think. The conventional wisdom is "always buy, renting throws money away." The honest math says it depends on four key factors: your local market, your time horizon, what mortgage rate you can get, and what you would do with the down payment money if you didn't buy.
In high-cost cities like New York, San Francisco, and Los Angeles, home prices are so high relative to rents that the opportunity cost of a down payment invested in a diversified portfolio often outpaces home equity growth — especially at current 6–7% mortgage rates. In lower-cost markets in the Midwest and South, buying frequently wins, particularly when you plan to stay for 10+ years.
The key insight that most calculators miss: both paths build wealth. Buying builds equity (and leveraged exposure to real estate appreciation). Renting frees up capital for investment. The question is which path builds more total wealth at your specific time horizon — and the answer changes dramatically depending on your assumptions about home appreciation and investment returns.
The Real Monthly Cost of Buying a Home
Most people only think about the mortgage payment. The true monthly cost of homeownership includes seven components:
| Cost Component | Example (350K home, 6.5%) | Notes |
|---|---|---|
| Principal & Interest | $1,769/mo | 30-yr fixed, 20% down = $280K loan |
| Property Tax | $350/mo | 1.2% of $350K annually |
| Homeowner's Insurance | $150/mo | Typical HO-3 policy |
| HOA (if applicable) | $0–$500/mo | Condos and many neighborhoods |
| Maintenance & Repairs | $292/mo | 1% of home value annually |
| PMI (if < 20% down) | $0–$280/mo | 0.8% on remaining loan balance |
| Minus: Tax Benefit | −$100/mo est. | If itemizing vs standard deduction |
| Total Monthly Cost | ~$2,661/mo | vs. mortgage-only perception of $1,769 |
Estimates for illustration. Your costs will vary by location, insurance provider, and loan terms.
The Opportunity Cost Argument for Renting
The most powerful argument for renting in high-cost markets is the opportunity cost of the down payment. When you buy a $600,000 home with 20% down, you're writing a $120,000 check. That capital is now locked in home equity — illiquid, leveraged to a single asset, and dependent on local real estate appreciation.
The renter who invests that $120,000 in a low-cost index fund at a historical average of 7–10% annually:
- • At 5 years: $120K grows to $168K at 7% — $48K of investment gains
- • At 10 years: $120K grows to $236K at 7% — $116K of investment gains
- • At 15 years: $120K grows to $330K at 7% — $210K of investment gains
The buyer needs the home to appreciate enough to overcome this opportunity cost plus cover higher monthly costs (mortgage, property tax, maintenance) compared to renting an equivalent unit. In HCOL markets, this math often doesn't work until year 12–15+.
When Does Buying Beat Renting?
Buying typically wins when several factors align:
- Long time horizon (10+ years): Closing costs (2–5%) and selling costs (5–7%) are amortized over more years. The average American moves every 7 years — buying in a short-stay scenario rarely makes financial sense.
- Lower-cost markets: Where rent-to-price ratios are high (home price is 10–15× annual rent vs. 25–40× in HCOL cities), buying generates positive cash flow or near-parity monthly costs, giving equity all the upside.
- Strong appreciation markets: In markets with 4–6% annual appreciation, leverage amplifies gains dramatically. A 5% appreciation on a $400K home = $20K/year, on a $80K down payment = 25% return on investment.
- Low investment return assumptions: If you'd invest conservatively (bonds, savings accounts at 3–4%), the opportunity cost of the down payment is low, making buying relatively more attractive.
- Tax benefits + high income: High earners who itemize deductions in a 22–35%+ bracket get meaningful tax savings from mortgage interest deductions, particularly in year 1–10 of a 30-year mortgage when most of the payment is interest.
Understanding PMI and How to Remove It
Private Mortgage Insurance (PMI) is required when you put less than 20% down on a conventional loan. It protects the lender (not you) against default risk. PMI typically costs 0.5–1.5% of the original loan amount annually, which on a $300,000 loan is $1,500–$4,500 per year ($125–$375/month).
PMI is automatically canceled when your loan balance reaches 78% of the original home value (Homeowners Protection Act). You can request removal when the balance reaches 80% of the current appraised value — which can happen faster if the home appreciates significantly. Our calculator tracks PMI month by month and automatically removes it when the LTV drops below 80%.
The PMI removal milestone is a meaningful inflection point in the rent vs buy comparison — often saving $150–$300/month, which changes the monthly cost delta significantly.
How to Read the Sensitivity Heatmap
The sensitivity heatmap is the most honest part of any rent vs buy calculator. It shows you that the winner is not determined by a single "right" answer — it's determined by assumptions about two key variables that no one can know in advance:
- Home appreciation rate: The x-axis. A 0% appreciation scenario (flat home prices) looks very different from 6–8% appreciation. In most of the last decade, US home prices appreciated 5–8% annually — but that may not continue.
- Investment return rate: The y-axis. If you'd invest the down payment and monthly savings in stocks (historical: 7–10%), buying faces stiff competition. If you'd park it in a savings account (3–4%), buying looks relatively stronger.
The "toss-up" grey cells in the middle of the heatmap represent the honest answer in many scenarios: both options are roughly equivalent, and your preference for stability vs. flexibility should determine the choice. The extreme cells (deep purple = buying wins big, deep teal = renting wins big) show the scenarios where assumptions matter most.
Frequently Asked Questions
How accurate is this rent vs buy calculator?
This calculator uses a full month-by-month amortization engine — not simplified estimates. It accounts for the P&I split each month (more interest in early years, more principal later), PMI auto-removal when LTV drops below 80%, the tax deductibility of mortgage interest versus the standard deduction, and the compound growth of the down payment + monthly deltas if invested. The main uncertainty is in your assumption inputs: home appreciation rate and investment return rate. The sensitivity heatmap shows you how robust your conclusion is to changes in those assumptions.
Should I include my home as part of my net worth?
Yes, but with nuance. Home equity (market value minus remaining mortgage minus estimated selling costs) counts as a net worth asset. However, your primary residence is an illiquid, non-diversified asset with carrying costs (property tax, maintenance, insurance). It's wealth, but not liquid wealth. Many financial planners separate "primary residence equity" from "investable net worth" for this reason. A common mistake is feeling wealthy because a home appreciated, while forgetting the $400K home also cost $150K in interest, $80K in maintenance, and $50K in property taxes over 20 years.
What if I can't afford the 20% down payment?
With less than 20% down, you'll pay PMI — adding $100–$400/month in costs. This weakens the financial case for buying further. Our calculator models PMI accurately with auto-removal when the LTV drops below 80%. Some programs allow 3–5% down (FHA loans, conventional 3% programs), but these come with higher mortgage insurance costs for FHA loans that last the life of the loan if your LTV stays above 90%. Running this calculator with 5–10% down scenarios often reveals the financial impact clearly.
Does this calculator account for rent increases?
Yes. The annual rent increase input (default 3%) compounds the rent each year, making renting progressively more expensive over time. In markets with high rent inflation (NYC, SF, LA: historically 4–6% per year), this significantly improves the relative position of buying over long time horizons. In markets with controlled rents or slower growth, the renter's cost advantage is more durable. Try adjusting the rent increase slider to see how it shifts the break-even year.
How do I use the Reverse Calculator to find my personal break-even?
The Reverse Calculator has three modes. "Breakeven Rent" finds the monthly rent at which buying becomes financially superior to renting (with your current home price and assumptions). "Breakeven Price" finds the maximum home price at which buying still wins over renting (with your current rent). "Breakeven Appreciation" tells you how fast the home needs to appreciate annually to break even by your target year. These three numbers give you powerful anchors for negotiating, evaluating specific homes, and setting financial expectations.